<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <MyHeader :addTodo="addTodo"/>
        <MyList :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo"/>
        <MyFooter :todos="todos" 
                  :checkAllTodo="checkAllTodo" :clearAllTodo="clearAllTodo"/>
    	</div>
    </div>
  </div>
</template>

<script>
  import MyHeader from './components/MyHeader'
  import MyList from './components/MyList'
  import MyFooter from './components/MyFooter.vue'

  export default {
    name: 'App',
    components: { MyHeader, MyList, MyFooter },
    data() {
      return {
        // 由于todos是MyHeader组件和MyFooter组件都在使用，所以放在App中（状态提升）
        todos:[
          {id:'001',title:'抽烟',done:true},
          {id:'002',title:'喝酒',done:false},
          {id:'003',title:'开车',done:true}
        ]
      }
    },
    methods: {
      //添加一个todo
      addTodo(todoObj){
        this.todos.unshift(todoObj)
      },
      //勾选or取消勾选一个todo
      checkTodo(id){
        this.todos.forEach((todo)=>{
          if(todo.id === id) todo.done = !todo.done
        })
      },
      //删除一个todo
      deleteTodo(id){
        this.todos = this.todos.filter( todo => todo.id !== id )
      },
      //全选or取消全选
      checkAllTodo(done){
        this.todos.forEach((todo)=>{
          todo.done = done
        })
      },
      //清除所有已经完成的todo
      clearAllTodo(){
        this.todos = this.todos.filter((todo)=>{
          return !todo.done
        })
      }
    }
  }
</script>

<style>
  /*base*/
  body {background: #fff;}
  .btn {display: inline-block;padding: 4px 12px;margin-bottom: 0;font-size: 14px;
    line-height: 20px;text-align: center;vertical-align: middle;cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
    border-radius: 4px;}
  .btn-danger {color: #fff;background-color: #da4f49;border: 1px solid #bd362f;}
  .btn-danger:hover {color: #fff;background-color: #bd362f;}
  .btn:focus {outline: none;}
  .todo-container {width: 600px;margin: 0 auto;}
  .todo-container .todo-wrap {padding: 10px;border: 1px solid #ddd;border-radius: 5px;}
</style>
